United States National Arboretum in Washington, District of Columbia

The United States National Arboretum in Washington, D.C., spans over 446 acres and showcases an impressive collection of plants, trees, and flowers, including the famed National Bonsai & Penjing Museum. Open to the public since 1959, the arboretum offers various themed gardens, winding paths, and educational programs on gardening and conservation. It serves as a peaceful retreat from the city's hustle and bustle, making it popular for visitors seeking nature. Guided tours are available to enhance the experience.